Electric implement.



L. PAULERO.

ELECTRIC IMPLEMENT.

APPLIGATloN FILED AUG. ze, 1912.

1,128,036. Patented Feb. 9, 1915.

2 SHEETS-SHEET 1.

MMM. um*

L. PAULERO.

l ELECTRIC IMPLEMBNT. APPLIOATION FILED AUG. 29, 1912. 1,128,036. e Petentea Feb. 9, 1915.

2 SHEETS-SHEET 2.

Wil/ll ATTURNEYS -securing it to the main body portion; Fig.\l

LOUIS PAULERO, OF PETERSBURG, VIRGINIA.

ELECTRIC IMPLEMENT.

Specification of Letters Patent.

l Patented Feb. 9, 1915.

Application led August 29, 1912. Serial No. 717,697.

To all whom t may concern 1 Be it known that I, LoUis PAULERO, a citizen of the United States, and a resident of Petersburg, in the county of Dinwiddie and State of Virginia, have invented certain new and useful Improvements in Electric Implements, of which the following is a specification.

My invention relates to improvements in electrically operatedv implements, and it consists inthe combinations, constructions and arrangements hereinafter described and claimed.

An object of my invention is-to provide a device especially adapted for cutting and carving stone, driving rivets, chipping and ca-lking, hammering, and in fact wherever it is desirable to employ a tool having a reciprocating motion.

A. further object of my invention is to provide an electrically operated implement ofthe type mentioned with novel means for closing and opening the actuating circuit so as to allow for the economical operation of the tool.

A@ further object of my invention is to provide a special grip for the hand of the operator using the tool, this grip inclosing the mechanism for making the various adjustments to the stroke of the plunger.

Other objects and advantages .will appear in the following specification and the novel 'features of the device will be particularly pointed out in the appended claims.

My invention is illustrated in the accompanying drawings forming part of this application iny which similar reference characters indicate like parts in the several views and in which:--

Figure l is a side view of fthe deviceg Fig. 2 is a longitudinal section therethrough; Fig. 3 is a section along they line 3-3 of Fig. 2; Fig. ^l is a section along the line 4 4 of Fig. 2; Fig. 5 is a section along the line 5-5 of Fig. 2; Fig. 6 is a perspective view of an endy plate; Fig. 7 is a perspective view of a portion of .the stroke adjusting mechanism; Fig. 1s a sectlonal View on the line 8-8 looking in the `direction of the arrow; Fig. 9 is a sectional View of the rear end of the tool and the ring for 10 is a faceview of the means for securing the terminals of the cable; Fig. 11 is a sectional view showing a portion of the cylinder which carries the solenoid coils; Fig. l2 is a sectional view showing a modified form of the tool; Fig. 13 is a front view of the form shown in Fig. 12; Fig. 14 is a sectional view through a handle which forms a portion of the modied form; and, Fig. 15 is a diagrammatic view showing the circuit connections for the solenoids.

Referring now particularly to Figs. l and 2 I have shown therein an exterior cylindrical `casing 1 which is preferablyv made of aluminum for the sake of lightness and which is provided with perforations 2. 011e end of this casing is threaded, to receive a cap 3. The .latter is provided with an inwardly turned flange 3a at its end arranged to engage the outwardly turned flange la of the chuck easing el. Openings l are provided in the flange portion la of the chuck casing for the purpose of ventilation, as will be explained later. The member el is also preferably made of aluminum. YVithinthe chuck casing l is disposed a rotatable member 5 which is provided with a longitudinal groove 5a. A pin 6 of hardened steel or other suitable material is carried by the chuck member el' and projects into the groove for the purpose of causing the meinber 5 to turn on its axis .when the chuck member 4 is turned by hand. A bushing 7 of hardened steel is driven into `one end ot' the chuck member .stand forms a socket for the tool 8. Disposed between the end of t-he casing land the flange 4 of the member 4 is a plate 9 which is perforated at l0. This plate has alateral cylindrical extension 9 on one side thereof. As will be seen from Fig. 2 the periphery ofthe plate 9 is'thrsaded toy engage the threads of the cap 3. 'When this plate 9 is screwed into the. cap where it is held by means of the casing l, the member l may be easily revolved by hand. As shown in Fig. 4. the plate 9 is provided with two wrench holes 9X by means of which the plate is screwed .in place. 1l is disposed within the extension 9a of the plate 9 and is provided with a head 1la arranged to be screwed to the threaded portion of the interior of the rotatable member 5. The member 11 is provided with ,a longitudinal recess l1" intolwhicha pin 9y carried by the cylindrical extension 9a of the plate 9 extends. This pin 9y pre- -vents the rotation of the member 1l around its axis but permits the latter to have a longitudinal movement inthe direction of its axis. The head 11a of the member' 1l A cylindrical memberV is provided with a threaded recess arranged to receive a cylindrical member 12. Near one end of the cylinder 1 is a plate 13, which has a cylindrical extension 13a on one side thereof provided with aY series of radially extending ventilating openings 13b.

5 This plate 13 is best shown in F ig. 6. lt

yhas a central opening 13c intowhich one end of a spool 14 extends. The latter is provided with a radially extending liange 14a. At the opposite end of the spool 14 is a plate 15, which forms one end of the spool.' Tvo coils 16 andv 17 are Wound on the spool the partition flange 14a separating these coils. vBetween the coils 16 and 17 and the outer casing 1 is a casing 18 which is preferably made of thin sheet iron or other magnetic material and 'which is perforated with -air holes 18a. ln the interior of the spool 14 is disposed a slidable plun# ger 19avhich is provided with a series of longitudinal grooves 19 and has at one end a reduced portion 19b which forms a striking head arranged to engage the striking pin 20. The latter is provided With a flange 21 and has a reduced portion 22 arranged to enter the member 12. Surrounding the portion 22 and disposed between the flange 21 and the endV of the member 12 is a spiral spring 23. Referring now to the plate 15, it will be seen that I have provided a pin 24 Whichis arranged to slide in a. groove 1X in the casing 1. This is for the purpose of preventing the solenoid from being turned on its axis and furthermore for .centering the plate 15. The latter it will be observed has an extension a which is threaded internally and which is arranged to receive a nut 26. Avcushion spring 27 is disposed within the interior of the spool 14, one end of this spring bearing on the nut 26. The latter is provided with an insulating washer 27 which is recessed to receive a contact 28. The contact has a laterally extending portion 28X (see Fig. 8) which is connected by means of a conductor 29 with the coils 16 and 17, (see Fig. 15) the conductor 29 passing through the insulating disk 3() which is carried by the extension 1511 and which is in contact with the plate 15. The members 26, 27 and 28 are provided with a central opening 31 for purposes of ventilation. On the plate 12c are mounted a pair of Contact members 32 and 33 respective-ly. (See Figs. 2 and 8). The former is connected to one end of the coil 16 by means of the conductor l 34, While the contact 33 is connected with the coil 17 by means ofthe conductor 35. c At one end ofthe device is an end piece 36' which is held by means of a screw cap 37, the latter beingV arranged to engage the threaded portion of the cylinder or casing 1. The end member 36 carries an insulating plate 38 upon whichl is mounted a contact member 39 to which is connected a lead Wire 40. A contact member 41 is connected to a lead Wire 42, While a central contact member 43 is connected to a lead Wire 44. These leads pass through the insulating member 38 and out-through the flexible connection 45 shown in Fig. 1, the Wires being suitably insulated from the vend meinber 36. The Contact member 43 is in this instance a spiral spring preferably of phosphor bronze. The cable 45 is preferably protected by means of a coil spring 46 which surrounds the cable and which passes through the end of the member 36, thereby protecting the cable from'injury through contact Wit-h the end member. rJlhe end member 36 is provided with a pin 36x (see Figs. 2 and 10) which v is arranged to enter the groove -1X in the casing 1 so as to bring the contacts 32 and 33 on the insulating plate into alinement With the contacts 39 and 41 respectively carried by the insulating disk 38.

F rom the foregoing description of the various parts of the device the operation thereof may be readily understood. The tool is designed to be used with a three-Wire circuit in which there is either a pulsating direct or an alternating current. The means by Which the alternations `or pulsations are produced forms no part of the present invention. lAny kind of a tool 8, such as a riveting tool may be inserted in the socket tool by means of the chuck case 4, which is shaped to lit the hand. By pressing on the end of the tool the operator forces the part 12 rearwardly, this part being connected with the member 11a, and the latter being 'secured to the part 5. These parts are also moved rearwardly. l have provided pins 45, which are arranged to pass through openings in the plate 9. These pins have one end in engagement with themember 5 and the opposite end engages a plate 13, Which forms the end of the spool. The latter together with the coils is moved rear- Wardly, so as to bring the contacts 32 and 39 into engagement and simultaneously the contacts 33 and 41. This completes a circuit, Which is as follows: from lead Wire 42W (see Fig. l) through 43, 41, 33, Wire 35, coil 17, conductor 29, 28,; 42, lead 44 to return Wire 44W. lThis causes the plunger 19 to be drawn inwardly toward the spring 27, which cushions the movement of the plunger at this end of the device. If. the current is a pulsating one,- the current will presently be cut orf from the Wire 42W and the Wire w Will become the active Wire. As soon as the Wire 40W is charged the current Will How from it lthrough the Wire 40, 39,l 32, conduc! tor 34, through the solenoid 16 and by the return Wire 29 to contacts 28, 43, 44 to return Wire 44W. The coils 16 and 17 are wound in opposite directions, and hence in the bushing 7.v The operator grasps the y when the coil 16 is energized the plunger will be pulled in the opposite direction and delivers its blow upon the striking pin 20, which in turn communicates it to the end of the tool S. The plunger 19 is formed of hardened steel, and tends to have residual magnetism, but as the polarity of the coil 1G is opposite from that of the coil 17 the effect of the striking of the plunger 19 is to neutralize all the magnetism left in it by the coil 1G, thereby allowing it to immediately release itself from the lstriking pin 20. It will be obvious that as long as the tool is pressed into contact with the work the connections will be eiected at the rear end of the solenoid through the contacts 32-39 and 33-41- When, however, the tool is withdrawn from the work, then the spring 42 will push the solenoids and their contacts 32 and 33 toward the forward end the tool is withdrawn from the work, prevents the overheating of the coils. Furthermore, the parts are kept cool bythe ventilating openings such as those shown at 4* in the plate 1, the openings 10 in the plate 9, the opening 13b in the plate 13, the perforations 1Sa in the casing 18, the perforations 2 in the outer casing 1, and the opening 31 through the nut 2G and the insulating washer 27. `With these Ventilating openings 'i the parts are thoroughly cooled, and hence the device does not become unduly heated, so that the tool may be operated at a cooler temperature than hitherto possible. The grocving ofthe plunger 19 also forms radiating strips between the grooves, which rapidly dissipate the heat absorbed by the plunger. The grooves 11" in the member 11 permit the passage of the air coming from the' openings 13b to the interior of the spool 14, so as to provide plenty of cool air for cooling the plunger.

The means for regulating the stroke of the plunger is as follows: n turning the casing 4. it will be observed that the member 5 will be rotated by the engagement of the,

pin (i in the slot 5a. (see Fig. 2). The rotation of the member 5 will cause a relative movement between the threaded head 11TL of the member 11 and the member 5 for the reason that the member 11 is prevented from turning by the pinv9", which is carried .by the extension 9n of the plate 9. This pin extends into a slot 11". The member 11 will therefore be forced inwardly when the memlwr 4 is turned in one direction, and outwardly when it is turned in the other direction. .\s the member 11 is moved` inwardly toward the plunger, the striking pin follows it. This, it will be seen, will tend to decrease the stroke of the plunger, while turnl of the tcol in which the chuck casing instead of being solid is provided with a series of grooves l for permitting access of the air nearer to the working parts and providing a series of radiating flanges am between the grooves 4, so as `to form a better vradiator of heat.

in Fig. 14, l have shown a modilied form ot' handle in which the tool is provided with a pistol grip 36g. This pistolgrip 36g forms an integral part of the'end member`36 and the wires l2, 44 and 4Q are carried out through the handle, as Shown in Fig. 14. The cable 15 in this instance is secured in position by means of anut 45k. The handle 36S is preferably made of aluminum.

As will be seen from Fig. 2, the reduced portion 22 o'l' the striking pin 2() in its normal position is Slightly away from the end of the tool S, so that when the pin is struck by the plunger 19, it delivers a much sharper blow to the lool than would` be possible if the latter were in Contact with the member 22, l desire also to call special attention to the fact' that the perforated casing 18 forms a 'magnetic path for the lines ot torce ot the solenoids 1G and 17, as well as protecting these coils. Another feature which should be emphasized is the *tact that the plunger is made of hard steel which`is demagnetized in the manner already explained. Heretofore the plunger 4has been made of soft iron capped with hard steel at its striking end. V 4

The device described above is of light weight, is economical of current, due to the fact that when the tool is withdrawn the circuit connections are instantly broken, and i does not heat up in operation, owing to the system of ventilation described. The ease with which the stroke of the hammer is adjusted alsov'renders the device capable of more extended use than with tools in which such adjustment is not possible.

l claim: f v y 1. In an electrically operated implement, a casing, a pair of solenoids mounted with- 'in said casing, a common plunger for said said casing, a common plunger for said solenoids, atool carried by said casing, means for alternately energizing said solenoids, thereby causing a reciprocatory movement ofsaid plunger, a striking pin disposed be.

said slidable spool, a' pair vof contacts carried by said slidable spool, a pair of contacts carried by said lcasing and arranged to be engaged by the first mentioned contacts, a common plunger for said solenoids, an eX- tension carried by said casing, a tool carried by said extension, a pin disposed between said plunger and. said tool for communicating the motion of the plunger to the tool, and movable means disposed between the tool and the spool for causing a movement of the spool to bring the contacts into engagement when the tool is pressed against the Work.

4. In an electrically operated implement, an outer casing, a spool disposed within said outer casing, said spool being provided with a pair of contacts at its end, a pair of contacts carried by the end of the casing and arranged to be engaged by the first mentioned contacts, a pair of solenoids carried by said spool, the movement of said spool serving to bring the contacts together, thereby energizing the solenoids, and a perforated sheet iron casing disposed around the solenoids and movable with the latter, said casing forming part of a magneticcircuit :tor the solenoids.

5. In an electrically operated implement, an' exterior casing provided withv a pair of contacts at its end, a slidable spool disposed within said casing, a pair of contacts on the yend of said slidable' spool arranged to engage said first named contacts, a spring disposed between the end of the casing and the end of the spool, a pair of solenoids carried by said spool, a source of current connected to the contacts on said casing, a tool., and means disposed between said tool and said spool for moving the latter to bring the contacts into engagen'ient.v

.6. In an electrically operated implement, an exterior casing provided with a pair of contacts at its end, a slidable spool disposed within said casing, a pair of contacts on the' end of said slidable spool arranged to engage said first named contacts, a spring disposed between tlie end of the casing and the end of the spool, a pair of solenoids carried by saidspool, a source of current connected to the contacts on said casing, a tool, means disposed between said tool and said spool for moving the latter to bring the contacts into enga gement, and a common plunger for said solenoids adapted to transmit motion to said tool.

7. In an electrically operated implement, an exterior casing provided with a pair of contacts at its end, a slidable spool disposed within said casing, a pair of contacts on the end of said slidable spool arranged to engage said first named contacts, a spring disposed between the end of the-casing and the end of the spool, a pair of solenoids carried by said spool, a source of currentconnected to the contacts on said casing, a tool, means disposed between said tool and said spool for moving the latter to bring the contacts into engagement, a common plunger for said solenoids adapted to transmit motion to said tool,.and means for adjusting the movement of said plunger.

8. In an electrically operated implement, an exterior casing provided with a pair of contacts at itsend, a slidable spool disposed within said casing, a pair of contacts on the end of said slidable spool arranged to engage said first named contacts, a spring disposed between the end of the casing and the end of the spool, a pair of solenoids carried by said spool, a source of current connected to the contacts on said casing, a tool, means disposed between said tool and said spool for moving the latter to bring rthe contacts into engagement, and a common plunger for said solenoids adapted to transmit m0- tion to said tool.

9. In an electrically operated instrument, an outer casinga solenoid slidably disposed within said outer casing, a chuck rigidly secured to said outer casing, a tool slidably carried by said chuck, meansdisposed between said tool and said solenoid for imparting a movement of the tool to the solenoid, contacts carried by said solenoid, and contacts carried by said casing and arranged to be engaged by the first named contacts during the movement of the solenoid.

10. In an implement, a casing, a plunger mounted within thel casing, a tool carried by said casing, means for causing a reciprci catory movement of the plunger, and a striking pin disposed between the end of the tool and the plunger for communicating the motion of the plunger to the tool, the end of said striking pin being normally spaced apart from the end of the tool;

LOUIS PAULERO.

Witnesses v JOHN MCS. BUCHANAN Riom). D. GILLIAM. 

